Home Secretary Charles Clarke is heading for "gridlock" on his anti-terror laws, Liberal Democrats warned.

Mr Clarke will unveil his new Prevention of Terrorism Bill today, which is expected to create "control orders" to hold terror suspects under house arrest. He needs the Bill on the statute book by March 10, when existing anti-terror laws come up for renewal.

He has run into opposition from both Liberal Democrats and Conservatives over his proposal he should personally impose control orders, acting on secret intelligence.

Following a meeting with Mr Clarke last night, Liberal Democrat home affairs spokesman Mark Oaten said the Lib Dems would vote against the Bill.